Ehm, I don't really know what to say, individually all pieces of this manga are incredible - backstory, leading cast, most side characters, art - one of the best time skips (imo) - I think at least for me the villains are the thing that don't allow all of those good bits to mix together. Especially in the second half.
Batista feels underwhelming to the monster he was shown to be in the beginning, Sora is... an idiot?
And for the big disaster, was it Nue Chimera after all?